Precipitation behavior of L12 Al3Zr phase in Al-Mg-Zr alloy

Mikhaylovskaya, A. V.; Mochugovskiy, A.G.; Левченко, В. С.; Tabachkova, N. Yu.; Mufalo, Walubita; Portnoy, V.K.

doi:10.1016/j.matchar.2018.02.030

Cited by 90 publications

(34 citation statements)

References 51 publications

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“…When the Zr content increases to above 0.2%, the Al 3 Zr appears by a peritectic reaction. The morphology of the Al 3 Zr particles is preferentially characteristic of the L12 structure (metastable) [ 26 , 27 ]. The cubic structure of Al 3 Zr is commensurate with a-Al (fcc) and acts as an effective heterogeneous nucleant of a-Al during solidification [ 28 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Zr Microalloying on the Microstructures and Strengthening Mechanism of As-Cast Al-Fe-Zr Alloys

Guan

Zhao

et al. 2020

Materials

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The microstructure and mechanical properties of Al-0.35Fe alloys with a series of different zirconium (Zr) additions from 0.1 to 0.4% are investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy and tensile testing. The as-cast structure of the alloys varies with the Zr content. When the content of Zr is 0.1%, Zr dissolves into the aluminum (Al) matrix completely and iron (Fe) concentrates along the boundary in a network of eutectic Al3Fe. With the increase in Zr content to 0.2% and above, nanoscale Al3Zr particles appear in the alloy. With the Zr content increasing from 0.1 to 0.4%, the grain size of the Al matrix decreases from 73 to 23 μm. The morphology of the eutectic Al3Fe phase changes from short rod-like to an agglomerated structure consisting of finer and shorter rod-like shapes. The tensile and yield strengths increase while the total elongation decreases with increasing Zr content. The strengthening mechanism of the alloy can be attributed to the combination of fine-grain, solution and second-phase strengthening.

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Section: Discussionmentioning

confidence: 99%

Effect of Zr Microalloying on the Microstructures and Strengthening Mechanism of As-Cast Al-Fe-Zr Alloys

Guan

Zhao

et al. 2020

Materials

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“…Fine-grained Al-Sc and Al-Zr aluminum alloys are currently a focus of many research efforts. These alloys have both higher strength and plasticity at room temperature [1,2,3,4,5,6,7,8,9] and exhibit superplasticity at elevated deformation temperatures [10,11,12,13,14,15]. Note that the precipitation of Al 3 (Sc,Zr) particles from an Al-(Sc,Zr) solid solution increases conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…This gives grounds to consider fine-grained Al-Sc and Al-Zr alloys as high-strength conductor materials that hold promise for advanced electrical machinery applications. A unique configuration of physical and mechanical properties in fine-grained Al-Sc(Zr) aluminum alloys comes from the positive contributions of Sc, Zr, and Sc + Zr to the mechanical properties of aluminum and Al-based alloys [1,2,3,4,5,7,8,16,17,18,19]. This effect is produced by the capacity of Sc and Zr to form nanodisperse coherent Al 3 Sc and Al 3 Sc(Zr) particles in aluminum alloys that facilitate the formation of a fine-grained structure after recrystallization and to make the recrystallization onset temperature significantly higher [6,10,19,20,21,22], as well as to contribute markedly to higher strengths in aluminum alloys [1,2,3,4,5,8,16,18,19,23,24,25,26,27].…”

Section: Introductionmentioning

confidence: 99%

“…A common solution to this problem is to dope fine-grained Al-Sc(Zr) aluminum alloys with magnesium (1.5–6 wt.%), which decreases the grain-boundary diffusion coefficient for aluminum [4,9,10,11,12,13,14,15,20,21,28,33,34,35,36,37,38]. This, in turn, shrinks the deposited Al 3 Sc(Zr) particles, facilitates the formation of a finer-grained structure during annealing, and additionally increases the strength and hardness of Al-Sc(Zr) aluminum alloys [10,21,28,34].…”

Section: Introductionmentioning

confidence: 99%

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Study of Structure and Mechanical Properties of Fine-Grained Aluminum Alloys Al-0.6wt.%Mg-Zr-Sc with Ratio Zr:Sc = 1.5 Obtained by Cold Drawing

et al. 2019

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The thermal stability of a fine-grained (FG) aluminum wire has been studied in Al-0.6Mg-Zr-Sc alloys with various scandium and zirconium contents. Specimens were obtained by induction casting followed by cold deformation. The FG alloys have been demonstrated to have high thermal stability of the structure and properties due to the annealing pretreatment (320 °C, 2 h, before drawing), which results in deposition of Al3(ScxZr1−x) intermetallic particles. It has been determined that following a prolonged annealing treatment (400 °C, 100 h), the alloys retain a uniform fine-grained structure with an average grain size of 2.4–2.8 μm whereas their microhardness measures 405–440 MPa.

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“…Microstructure can also be controlled by the method of minor alloying. It is found that addition of small amount of alloying elements such as Zr, Ti and Sc increases the thermal stability of Al-Mg alloys by the formation of dispersoids and also changes the crystallization behavior [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of rolling on the fractional recrystallization behaviour of Al-Mg and Al-Mg-Zr alloys

Kaiser¹,

Shorowordi²,

Rashed³

2019

J. mech. eng.

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One set of Al–Mg and Al-Mg-Zr alloys are directly cold rolled and other set of those alloys are hot rolled and then cold rolled using a laboratory rolling mill. The effect of rolling on the fractional recrystallization of the alloys has been investigated using the micro-hardness variation. Isothermally annealed samples are also studied using JMAK type analysis to see if there exists any correlation between experimental and JMAK type analysis. From the microstructure, it is observed that the Al-Mg alloy becomes almost fully recrystallized state after annealing at 600°K for 60 minutes. The results also show that recrystallization fraction obtained by the two methods, shows the higher variation in zirconium added Al-Mg alloy as compared to the Al-Mg alloy. The fractional recrystallization of the cold rolled Al-Mg-Zr alloy is significantly lower than that of cold rolled Al-Mg alloy and hot and colled rolled Al-Mg-Zr, owing to the presence of fine Al3Zr precipitates. These metastable L12 Al3Zr precipitates are thermally stable at high annealing temperatures.

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Precipitation behavior of L12 Al3Zr phase in Al-Mg-Zr alloy

Cited by 90 publications

References 51 publications

Effect of Zr Microalloying on the Microstructures and Strengthening Mechanism of As-Cast Al-Fe-Zr Alloys

Effect of Zr Microalloying on the Microstructures and Strengthening Mechanism of As-Cast Al-Fe-Zr Alloys

Study of Structure and Mechanical Properties of Fine-Grained Aluminum Alloys Al-0.6wt.%Mg-Zr-Sc with Ratio Zr:Sc = 1.5 Obtained by Cold Drawing

Effect of rolling on the fractional recrystallization behaviour of Al-Mg and Al-Mg-Zr alloys

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